Voltage converter case



FIG. 1 is a perspective view of the voltage converter case showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a back elevational view thereof. 

The ornamental design for a voltage converter case, as shown and described. 